Originally posted by: intelcore2duogrid
Originally posted by: RichUK
you're just unstable, nothing to do with temps. You require most likely more CPU voltage. Keep upping the voltage in the smallest increments within the BIOS until you stop failing prime. Try not to go over 1.55v and keep an eye on the temps as you increase. You are exceeding 3.5Ghz with 1.425v, I doubt you will get that sort of clock stable without 1.5 Vcore in all honesty.
Have you looked at the voltage on the NB and SB. I found on my P5B that upping the voltage to the SB to 1.7v and the FSB termination voltage to 1.4 solved a few issues i had with high FSB. Also as the FSB increases you will need to up the voltage to the northbridge dont be afriad to use max volts of 1.65.
Also download SP2004 Orthos. Its much easier to use (better GUI)
Thanks for your quick reply.
I was sick of rebooting so I just cranked Vcore to 1.525 (EasyTune only showing 1.49-1.50 though?) to see if that was stable at 3.5GHz using SP2004 Orthos. CPU temp has climbed to a max of 49C (Everest Ultimate about 10C higher per core) but Orthos is no longer failing after a few minutes. Looks like I'll need to start stepping down Vcore to the lowest point where I'm stable.
The only option I have for FSB voltage is an "OverVoltage Control" (e.g. +0.1, +0.2, +0.3). I've also got overvoltage controls for DIMM, PCI-E, and (G)MCH.
Nice work, and nice temps for that voltage. You dont really want to exceed 60 degrees. So keeping it in the low 50's is good going.
If you are happy with 3.5Ghz (which to be fair isn?t too shabby). Then as you said just scale down the voltage as low as you can at that frequency. The discrepancies between the BIOS reading and the software readings is normal. I usually prefer to go by what CPU-z states, however for accurate reading you could use a DMM. I wouldn't worry though as the voltage is not too excessive at this point, 1.55+ would be in my opinion.
Now if you want more speed from your processor you will have to tweak the other voltage adjustments. I would personally keep the voltage you currently have on the processor (around 1.525), and try and up the FSB in small increments until you become unstable.
I'm pretty sure that +0.2 will bring the FSB termination voltage upto around 1.4v. But this is usually a last resort as it is not always needed to be increased. The MCH is the northbridge, and the increased voltage to the MCH increases the stability for high FSB. I think the max voltage for you is 1.65, as it is with me and my P5B. It is safe to up the voltage to 1.65, quite a few people look for more voltage, and resort to volt mods, as I am doing. Of course this is only if your FSB starts crapping out.
I also have the HZ sticks. I would not recommend running as loose timings as you are. set them to 4-4-4-12 and just up the voltage to around 2.25-2.3. This will allow you to keep the sticks running 1:1 with the FSB without failing.
You could try lowering the CPU multi to find the max FSB and eliminating the CPU from holding you back.
Personally I just set the voltage to the processor that I am happy with. For instance 1.55v. I then up the FSB until you start seeing boot failures with the windows loading screen and or stalls/crashs within the OS. By this time I will up the voltage to the MCH, and keep doing so as I up the FSB so to stabilise. Increasing the voltage to achieve higher FSB is akin to increasing the voltage to the processor for faster frequencies. This is the basic way to OC, you will find that little things like the southbridge voltage and the FSB termination voltage can also hinder the max FSB and upping the volts to both can aid in stability.
Obviously the DIMM voltage only needs to be adjusted as you up the frequency of the RAM, I am currently running my sticks at 2.1, but wouldn't hesitate to run at 2.25-2.3, as that is only overvolting them by ~0.1 over the recommended voltage of 2.1-2.2.
Remeber within Orthos. Small FFT's for the CPU, then test large FFT's for your RAM frequency and timings stability.